Improvement in boileh-furwaces



mi dimitir'.

GORDON HALL NOT'I, OF BOSTON, MASSACHUSETTS.

Letters Patent N 95,601, daad october 5, 1869.

The Schedule referred to in these Letters Patent and making par-t of thesame.

-that the following is afull,clear, and exact descriptionof..theconstnuctionaud. operation of the same, reference being had' tothe annexed drawings, making a part of tliis specileation, in wliicli-Figure 1 is a. longitudinal section of the furnace, and Figure 2 is aground plan of the same furnace. The nature of my invention consists inproviding a protection for the tubes and tube-sheets, as well aslbringing the iiiiconsumed fuel tliatotlierwise would be lost into thecentral or hottest portion of the fire-box or furnace.

On the annexed drawings-` a is an ordinary furnace or lire-box, withgrate-bars b, whereupon rest tlie fuel, as usual.

c is the door for feeding the furnace.

d d are tubes, through which the heat passes after leaving the furnace.v

e is a solid wall or division, represented on the vdrawing as being madeof tire-brick, extending from the crown-sheet to a place alittle lowerthan the lowest -row of tubes.

ff are solid walls or divisions, extending also from the crowns`heet toa place lower than the wall e, so as to allow a sutiiciently largepassage, g, for the gases to pass through between the walls beforeentering the tubes.

The working of iny improved furnace may thus siniply be described.

The burning fuel emits unconsunied sinoire and gases, which readily passawayin an ordinary furnace,

but with my improved one the smoke and gases strike solid walls ff, andare by this means thrown back vagain into the central or hottest-placeol the furnace,

and there partially consumed. Atterward, the gases strike, in their wayonward, the solid wall Ac, where the yet unconsuined parts rebound againinto the central part of the furnace, to be yet more fully cons'uulied.

lhe gases now pass between the walls eaudjf into a space, h., behind,and enter then into the tubes or ilues leading to the chimney.

It will readily be understood, by the above description, the solid wallse and ff are safe moans for the protection oi' the tubes and tube-sheet,as the exceedingly liot gases arising from the fuel do not at hist comein contact with the tubes and tube-sheet, until the gases havev firststruck agaiiisttlie solid walls and there condensed a portion of theirheat.

As a natural consequence, the solid walls also arrest and rebound suolisparks and ciiiders that may be drawn into the tubes from the.grate-bars.

Having thus described the nat-ure and working of my invention,

I wish to secure by Letters Patent, and elaiin--l The construction andarrangement of vthe protective walls e and ff, all facing the fire, withtheir concave sides before the tube-sheet in the furnaces of boilers,for the purpose as fully set forth and described.

('lORDUN H. NOTT. .Vitiiesses:

ALBAN lGr. Amarins', A. L. B. STEVENS.

